Rotary cutting-off saw and the like.



ROTARY GUT'ITING-OFF SAW AND THE LIKE.

APPLICATION FILED 001. 25, 1912. 1 073 193. "Patented Nov. 11, 1913.

QZSHEBTS-SHEET 1.

QL LQWHH W A/lZney WITNESSES G. GORTON.

ROTARY GUTTING-0FF SAW AND THE LIKE.

APPLICATION FILED OOT.25, 1912.

Patented Nov. 11, 1913.

2 SHEETSSHEET 2.

WITNESSES 2f [8, 9M 6 Q49/L l NIT STAWENT OFFICE l Specification of Letters Batent.

' Saws and the like, of which the following is a specification.

This lnventlon relates to cert-am improvements in metal cuttmg-ofi' saws of the internal type; and the objects and nature of my invention will be readily understood by those skilled-in the art in the light of the following explanation of the accompanying drawings showing what I now believe to be thepreferred embodiment from among other formations, arrangements and constructions within the spirit and scope of my invention.

This case constitutes a substitute for and a continuation in art, of my application s. No. 682,909, file March 11,'1912, for improvements in rotary metal cutting off saws, The invention consists in certain novel features 1n construction and in comblna- .tions and arrangements as more fully and particularly set forth and specified hereinafter.

Referring to the accompanying drawings:Figure 1, is a side elevation of a saw embodying my ,invention. Fig. 2, is a section on the line 22, Fig. 1. Fig. 3, is a section on the line 33, Fig. 1. Fig. 4, is a section on the line 4 4, Fig. 1. Figs. 5, 6, and 6", are detail views of modified formations. Fig. 7, is a detail view of-a-modified form wherein small high-speed'ciitters are inserted in the blocks.

An object of this invention is to provide a metal saw or cutting off device wherein the blade, drum or cutter holder has a central work receiving opening and carries .a. ring consisting of a minimum number of abutting thrust sustaining elements surrounding said opening and suitably uniformly locked to the blade to be carried and driven thereby, said series of elements comprising locking wedges or e uivalent elements projecting into the bla e (as by fitting in radial pockets therein) and intervening blocks or the like, fitting the edge of the blade around the opening and locked by said wedges and provided with cutting points or otherwise shaped, or formed to provide cutters.

In the drawings,- I show a blade 1, formed able rotary driving drum or hollow hub.

This blade is formed with a central Work receiving opening 10, and with a series of approximately radial pockets, slots or seek ets 11, uniformly spaced around the central opening and at their. inner ends opening thereinto. The series of thrust sustaining elements consists of several preferably similar radially arranged locking keys or wedges 2, and a like number of preferably approximately similar intervening blocks 3, forming cutters and abutting against the keys 2. The curved outer longitudinal edges 30, of the blocks (cutters) longitudinally fit and conform to the curvature ofthe edges 12, of the blade intervening between the pockets, and the block edges 30 are preferably slightly greater in length than the edges 12, of the blade and extend from pocket to pocket. The edges 30, and 12, of the blocks and blade are preferably longitudinally and correspondingly grooved and ribbed, approximately as shown to interlock for the purpose of stiffening the blocks against lateral stresses. In the specific example illustrated, I show the edges 30, of the blocks beveled off on their side faces to form a projecting central V edge, while the edges 12, of the blade are correspondingly grooved to receive and center the same, although I do not wish to so limit my in- Patented Nov. 11, 1913.

vention. The blocks 3. are also formed with opposite or front and rear transverse end edges 31, 32, usually forming approximate inward continuations of the adjacent edge walls of the pockets.

The inner longitudinal portion of-each block between the end edges 31, 32 is provided or formed with an inwardly 191'0160ting cutter or working point or end 33, and usually with a cutter throat 34.. The cutters (blocks 3) are locked together and to the saw blade, by driving the keys between the ends of the cutters and tightly into the pockets in the saw blade so that the projecting inner ends of the keys will. be tightly wedged between the cutters and each cutter will be backed by a key tightly abutting against or 'backed by the front end of the next succeeding cutter in the direction of rotation of the saw blade. The longitudinal edges of the keys and edge walls of the pockets are correspondingly ribbed' and grooved to interlock against lateral displacement of the keys and to properly center the keys taper approximately from end to end and the longitudinal edges 20, thereof converge from the inner ends of the keys toward the outer ends thereof, and the longitudinal edges of the pockets 11, and the end edges 31, 32, of the cutter blocks are correspondingly inclined. The cutter blocks are preferably a very I slight fraction of an inch longer than the distance between the pockets. Usually the variation in length between the cutter blocks and the blade edges between the pockets is not perceptible to the eye without the use of instruments, but is suflicient to place the ring of' thrust sustaining elements when the keys are driven home, under greater pressure, tension or strain than the pressure or tension exerted by the keys on the blade, thereby releiving the tableof the 1 excessive pressure usually necessary to properly maintain the thrust elements. The keys wedge in the pockets under sufficient pressure to prevent loosening thereof and to tie the ring or thrust elements to the blade and to drive the same with the blade and to dis tribute the stress and strain of the cutters in action uniformly about the blade. The keys most tightly lock the thrust elements together into a ring of rigid thrust receiving, sustaining and transmitting elements whereby the thrust of the cutters in action is distributed through said ring and completely around the blade opening. However, possibly. one longitudinal edge only of each key might be inclined leaving the other edge straight or as shown in Fig. 5, each blade pocket might have straight parallel edges, and the portion of each key tightly fitting in the same might have straight parallel edges with the outer end of the key forming the wedge and having inclined outwardly converging edges 21, to rigidly lock the ring of thrust elements. The locking key arrangement might be reversed, '5. e. the keys might be locked by inward longitudinal movement instead of outward longitudinal movement in accordance with the formation disclosed by Fig. 1.

- In Fig. 6, I show a formation wherein the inner end of the key 25, reduces inwardly to constitute a wedge by the formation of inclined edges 35, so that the key locks the cutter blade by inward longitudinal movement toward the axis of rotation. driven away from the pocket floors or abutments to lock the cutter blocks and are forced toward said floors to release the cutter blocks, the end edges of the cutter blocks being The keys are formed to correspond to the inner and edges of the keys to attain this result.

In the formation shown by Fig. 6, the same result as in the structure of Fig. 6, is attained by tapering each key 25, throughout its length, the longitudinal edges 35 of the keys converging toward the central 0 ening of the saw, the cooperating edges 0 the pockets and cutter blocks being correspondingly inclined.

In order to maintain keys that look by inward movement, against loosening movement in the blade, I show each key 25 or 25, formed with a longitudinal threaded socket in its heel or outer end and receiving a headed tightening screw .9, longitudinally adjustable therein and having its head 8, projecting beyond the key and adapted to seat or abut against the pocket floor.

/Those skilled in the art will readily understand that after the cutter blocks and keys have been assembled, fitted to the blade and tightened by forcing the keys inwardly to ward the axis of rotation of the saw, that the parts can be tightened to the limit and locked in such positions by rotating the screws 8, of the keys to unscrew them from the key ends, while the screw heads are seated against the pocket fioors. When it is desired to remove one or more cutter blocks, the keys will be first unlocked by turning the screws in a direction to screw them into said keys.

It will be observed that during operation, the thrust of the cutters in action is transmitted around the ring of abutting elements and hence distributed around the table through the medium of the keys. Further more, should a cutter point break, the blade will be protected against injury by the body portion of the cutter and by the adjacent key.

Those skilled in the art will readily understand the advantages and utility of such an arrangement whereby the blade is protected and the strain and thrust of the cutters is distributed, and yet whereby cutters are rendered readily removable and renewable.

In the construction disclosed by Fig. 7, I show a construction wherein the blocks 3, (corresponding to blocks 3, of Fig. 1) are formed with pockets 3, to receive and hold pieces of tool steel or high duty or so called high speed steel to form the cutting or working points 33, of or for the blocks. These cutting points or inserted cutters 33, can be inserted and secured in the blocks in any suitable manner or by any suitable means, preferably so that they can be removed therefrom when worn out to permit insertion of new or perfect cutting points, or if so desired to permit removal of the points for sharpening, although it is my present intention not to remove the cutting points from the blocks for sharpening.

In the particular example illustrated by Fig. 7, the pieces of steel 33' are formed with & 1,978,198

aslight ape! riamaawaa aa intathe points into the blocksagainst accidental displacement. When the. cutting points wear out or become defective, thevcan-be-knocked out and new points inserted." Even ifilth'ese points are composed of high priced material, they; cambe triad; ,cpmparatively small as they are carrie( by the blocks, and. hence the expense of discarding pointsaften a; few grindings will not be excessive.

It is evident that various. changes, modifications and variations might be resgrted tq withoutde arnagfli mthesmrai nd scape of my mvention and hence I do not ry-rah,

to limit my invention to the exact disclosu hereof.

What I claim is 1. A saw having a central work receiving opening and a series of blocks surrounding said opening and provided with cutting points projecting thereinto and intervening keys abutting against said blocks and locking the same to said saw against lateral deflect-ion and to rotate therewith, whereby a ring of abutting thrust sustaining elements is formed.

2. A saw having an annular series of radial uniformly spaced pockets and intervening edges, a series of blocks provided with cutting points, said blocks being fitted to the saw edges between said pockets, and keys fitting said pockets and intervening between, abutting and locking said blocks.

3. A blade having a central work receiving opening, removable uniformly spaced blocks arranged around said opening and fitted to the blade edge, said blocks provided with cutting points within said opening, and means locking said blocks to the blade.

4. A holder having a central work receiving opening and an annular series of abutting thrust sustaining elements removably locked to said holder and arranged around said opening and consisting of blocks provided with cutting points and keys intervening between and abutting against the blocks and locking the blocks to the holder.

5. A holder having a central work-receiving opening and radially arranged key sockets uniformly spaced around said open ing, a series of removable blocks fitting the holder between said sockets and having cutter points in said opening, said keys fitting said sockets and intervening between, abutting and locking said blocks.

6. A blade having a central work receiving opening, a series of removable blocks arranged around said opening and fitting the blade edge and provided with inwardly projecting cutter points, and means for looking said blocks to the blade and in connection therewith forming a ring of abutting thrust sustaining elements.

ng. opening, and anifiormly; spaced pek "arranged around. said ripening; b1 ,prowaded Withfillttfisrfi, sai vabloo remo b y z fittmg the blade ed .betweensaido wings and being -slightl fi ongel than the istan' fitting said pockets,- and interposed betwe n and .engagmgsaid blocks and ,locking the =..'SaIne;tQ;fll$l;b ade betweenthekeys. 8.1.Acuttingloif.sawteonsistmgnf a blade shaving a central work receiving opening, :and a. .r of abutting thrust re eiving and transmitting elements locked to the blade anv arra ged around. a d erasi there an composed of a series of abutting cutter -blocks. and keys, the cutter blocks being arlganged between and alternating with the eys.

9. A cutting ofi saw comprising a blade having a central work receiving opening, blocks longitudinally fitted to the curved edge of the blade around said opening and at their inner edges formed with cutters, and means for removably locking said blocks to the blade.

' 10. A saw blade having a central work receiving opening, an annular series of uniformly spaced blocks arranged in' and around said opening, and means comprising blade pockets for locking said blocks in the opening-and to rotation with the blade, each block formed with a cutter.

11. A saw blade having a central work receiving opening, a series of blocks having cutters at their inner longitudinal edges and having their outer longitudinal edges curved and formed to fit and interlock with the edge of the blade about said opening,

-and means spacing said blocks and locking them in operative position with respect to the blade. j

12. A rotary saw blade, blocks having cutters at one edge and at the opposite edge removably fitted to the saw blade edge, the edges of the blade and blocks interlocking posed between said blocks and locking them together and to the blade.

13. A rotary saw blade having edge pockets, keys therein and projecting therefrom and provided with looking screws abutting the floors of the pockets for forcing said keys outwardly in the pockets to locking position, and cutter blocks locked to the blade by such keys.

14. A saw blade having spaced pockets and intervening edges, cutter blocks fitting said intervening edges between the pockets and tapering keys wedged between and engaging the ends of the blades at the exterior of said pockets and wedged in said pockets to lock the blocks to rotation with the blade.

15. A blade having a central work receiving opening, a series of removable blocks =.bctweenf.the p ets, and keys, removably against lateral deflection, and keys inter- .h Ahladehaving'acentrala ork recei arranged around saidopening and fitting the blade edge and provided with inwardly rojecting cutter pomts, and means for locklng said blocks to the blade and in connection therewith forming a rin of abutting thrust sustaining elements, said block having pockets and inserted pieces locked therein to form said cutter points.

16. A blade having a central work receiving opening and umformly spaced pockets arranged around said opening, blocks provided with inserted cutting points, said blocks removably fitting the blade edge between said openings and being slightly longer than the distance between the pockets, and keys removably fitting said pockets and interposed between and engaging said blocks and locking the same to the blade and between the keys.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE GORTON.

Witnesses E. S. GERE, C. ERLANDSON. 

